Ceecee was a prisoner at Thinktwice penitentiary.
When Majenta Pryce and Ceecee got into a fight, Ceecee was taken to Jonah Gripton. He hooked her up to the Knowsall machine, which drained her memories, leaving her functionally braindead. The Doctor and Majenta Pryce later found her discarded body. (COMIC: Thinktwice)